| Firstly, the basic theory of near-mirror-EDM is introduced. Methods to achieve Near-mirror-EDM are analyzed according to the influence factors of EDM. Then the processing properties of EDM are recommended which includes basic properties and technic indexes. The basic theories and applications of new powder supply units, fuzzy control technology and powder-mixed EDM (PMEDM).Through summarizing the research results both at home and abroad, fine surface finish machining based on microemulsion is proposed. Experiments based on different peak current, pulse-on time, processing area and finish machining time show microemulsion is effective to better surface roughness. With traditional EDM and microemulsion mixed EDM, two planes of 490mm2 are gained, whose surface roughness are 0.81μm and 0.26μm respectively. The results show microemulsion is feasible to improve the surface roughness and the machining stability.Finally, research on machining mechanism is done based on the experiments and tests. The results reveal that black pigments can suspend in the kerosene stably with the average diameter is 1130nm, which can improve the circulation condition and the machining stability. At the meantime, black pigments also can improve the surface roughness, which function as powders in PMEDM.
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